Subcutaneous syringe.



'A. SCHROBDBR. SUBGUTANEOUS SYRINGB. APPLICATION FILED IAILS, 1910.

Patented' Nov. 7, 1911.

FLW'.

AUGUST SCHROEDER, 0F STRASSBU'IRGQ GERMANY.

SUBCUTANEOUS SYRINGE.

To all whom 'it may concern:

Be it known that I, AUGUST SCHROEDER,-

harmaceutical chemist, a subjectv of the ing of Prussia, German Emperor, and a resident of Schiltigheimerpl. 12Strassburg,

Elsass-Lothringen, German Empire, have invented certain new and useful Improve-` ments in Subcutaneous Syringes, of which the following is a specification..

The invention relates to subcutaneous syringes used for the purpose of administering solutions of medicaments underneath the skin of the patient. With such instruments it is peremptory that both the solution and Vthose parts of the instrument which come into contact with the former are sterile. In order to avoid the necessity of steriliaing the syringe cylinder every time before it is going to be used, it has been suggested to use as cylinder the same vessel in which the solution is packaged. The device carrying out this idea, however, shows several disadvantages which cause pollutions and destroy the sterility. This is mainly due to the fact, that the needle must pierce the stopper before reaching the solution and being able to deliver it for hypodermic purposes. The needle thereby is bound to get clogged and ineffective and to introduce impurities into the medicine which destroy its sterility.

It is the object of my invention to avoid these disadvantages and to secure a thoroughly sterile application of hypodermic medicaments. 4 l

Another object consists in providing means for rendering the manipulation of administering subcutaneous injections so easy that the physician practically does not n eed to emplo any real strength or dexterity, as was hitherto undispensable, but can concentrate his whole attention to more important observations. l

With these objects in view my invention consists in employing for the vessel which serves as cylinder a stopper which 1s provided with a boring against which the needle only needs to it in order to secure the proper delivery of the fluid. Means are further provided by which the operator need not expose the boring in the stopper until the instrument. is being used, and also means that'the stopper may smoothly slide toward the bottom of the vessel when pressed inwardly by the end of the needle.

Further my invention provides special means for manipulating an injection bythe Specification of Letters Patent.

Application led January 3, 1910. Serial No. 588,198.

Patented Nov. 7,

to hold needle and vessel in the proper way as formerly done by the hand of the physi' cian and allowing the vessel to be moved against the needle in such a way as to secure the proper operative effect i. e. expelling the medicine through the needle. This movement can be effected by hand but preferably by the action of a spring mounted inside the instrument, means being.A provided to re late the force produced by this spring against the vessel and also means for arresting at 'certain intervals the forward movement of that part which carries the vessel. l I refer now tothe accompanying drawings, in which similar reference numbers designate similar parts and of which- Figure 1 represents a longitudinal section of the syringe, containing the vessel and needle and showing in dotted lines one segment of the outer casing in the position which allowsthe setting of a new vessel; Fig. 2 gives an outside view of the syringe without vessel and needle seen from a point of view at right angles to that of Fig. 1; Fig. 3 gives another outside view seen from the opposite side to that from which Fig. 1

cross-section is circular as appears in Fig. 4. At the bottom end of the same is fas-v tened a solid foot-piece h through which the shaft lmJ enters the inside part of said casing in such a way that it can easily be moved in and out by means of a button n, placed at the outside end of said shaft. The other end of the shaft. m is threaded and has a member lv secured to it, which is so shaped as to fit well into the inner circle of the casing a, giving the shaft m a good guidance in its movement to and fro. Member 'v is at one side prolonged in form of a thin wall lv1, ywhich ends in an inwardly extending rim 'v2'. This member lv, 01, '0 2 serves to receive the vessel containing the medicine p pin f of the casing a..

top of the casing should the point of the syringe be held down. A segment b of the 'casing a is cut off and is hinged to the same at o, so that this segment can be, removed, as indicated with dotted lines in Fig. 1, for putting a new vessel into the member fv, '01, o2 which is thereby laid, open. To the top end of the casing a a-member c is fastened by means of screws and projects both ways m toward the inside of casing a and also 1n the opposite direction, serving to hold the needle in its hollowed center over a considerable length, of the same in order to avoid any possibility of the same getting any way 15 damaged. The member c 1s not closed all around, but a sector g is cut off corresponding to the segment which is hinged to the casin a, while the same segment possesses a 'projection g1, which minutely lits into the sector and is exactly ofthe same shape as the member o. The part g1 presses slightly against the needle when the segment b is closed. A loose rim d is cut out at d1 and possesses a slot g by which it is guided on a This rim can be turned so that it locks the segment b within its end circle but allows the removal of the segment when the sector d1 registers with `part g1 of the segment b. A projection p serves as handle when opening the segment b. l

Between the member e and the foot-piece 'k is placed a helical spring u tending to move both parts away from each other. Such a movement is however checked by two devices, one of which is meant to regulate the speed of this movement while the other enables the operator to limit the length of it.

A projection c' of the foot-piece h holds a screw and guides a brake-member Z which can by means of the screw be more or less pressed against the shaft m and so influence the speed of the movement of the latter. Another projection in form of a guide m5 attached to the casing a serves as guidance to. a pin which passes through the guide w8 and possesses at its other end two lateralprojections m5 engaging under the influence of the spring we two rack-bars m1 and m2 which are rigidly connected to the member o, 'v1 02.

When the pin is pressed down, the two lateral projections m5 free the two rack bars and thereby allow the member fv, lv1, 'v2 to move. lWhen the pin et is not pressed down, the two projections ai are pressed against the two rackbars by the spring ai and so prevent member fu, 01, 'v2 trom moving forward the top of the syringe. This device enables the operator to inject the exact quantity he may wish. ln order that the operator can see'if the dose is correct, the outer casing ot the instrument is pro- 65 vided with a slitf," underneath which a mark s1 is visibleon the wall o1 of member fu, v1, fv. By means of a scale s on casing a any movement of the member fu, o1, 02, can be minutely observed. The needle y is provided in such a way with a collar y1 and a conical end-piece y2 that the member c exactly fits between both, and that the needle is held` securely in position. The conical end-piece is so 'shaped as to lit in the boring Aw1 of the stopper lw2 of the vessel fw. In order that the stopper fm2 may easily slip toward the bottom of the vessel, when this ismoved against the needle, the stopper is provided with an annular recess 'w which prevents the stopper from sticking to the glass of the vessel at the same time securing its action as a piston when the needle is pressed toward the bottom of the vessel.

The stopper 'wz is made of elastic material as caoutchouc. Before use the boring of the stopper is closed by a cover fw, preferabl of elastic material as caoutchouc, which 1s brought sterile upon the vessel when the same is still' warm after being filled. When cooling down the cover is firmly pressed on the vessel and stopper by the vacuum arising inside and is somewhat drawn into the boring by the same means. The physician can by this latter sign easily determine if a vessel is intact i. e. sterile.

For using the instrument he proceeds (as follows: The cover is removed from the vessel and the latter placed into the member c, 121,02, so that the con'ical end of the needle which must `also be sterilized enters the boring of the stopper. After closingand locking the segment b the needle is inserted under the skin of the patient and pin m* pressed down until the mark s1 reaches a certain place on the scale s corresponding to the quantity to be injected. The speed'ot the injection can be regulated by screw c.

ln Fig. 6 is shown a syringe for handmanipulat-ion, which is constructed similarlyto the one described before, but which possesses no spring u for driving the member fu, ful, U2 or means for regulating speed and length of movement. rlhe operator lays two lingers through the two handles y and presses with another finger on the button n. Even in this form the new syringe represents a considerable progress in comparison with known devices, because vessel and needle are held by the new instrument in the proper. way and because the boring in the stopper secures a thoroughly sterile injection.

l claim:

l. lin a subcutaneous syringe, in combination, a liquid-containing receptacle having a normally perforated stopper adapted to move relatively with respect to said reeoA ceptacle, a' needle adapted te engage said i for moving said receptacle toward said needle, whereby the stopper will be forced to move into said receptacle.

2. In a subcutaneous syringe, in combination, a li uid-containing receptacle having a norma ly perforated stopper adapted to move relatively with respect to said re ceptaole, a needle having aportion engaging said stopper and extending Within said 10 perforation, and means for moving said receptacle toward said needle, whereby said stopper will be forced to move into said receptacle. v

In witness whereof, I have hereunto signed my name in the presence of two sub- 15 scribing witnesses.

.AUGUST SCI-IROEDER. Witnesses.:

LOUIS I. MUELLER, MATHILDE K. HELD. 

